Chú thích Tứ_giác_nội_tiếp

  1. 1 2 Usiskin, Zalman; Griffin, Jennifer; Witonsky, David; Willmore, Edwin (2008), “10. Cyclic quadrilaterals”, The Classification of Quadrilaterals: A Study of Definition, Research in mathematics education, IAP, tr. 63–65, ISBN 978-1-59311-695-8 
  2. ↑ Joyce, D. E. (tháng 6 năm 1997), “Book 3, Proposition 22”, Euclid's Elements, Clark University 
  3. 1 2 Andreescu, Titu; Enescu, Bogdan (2004), “2.3 Cyclic quads”, Mathematical Olympiad Treasures, Springer, tr. 44–46, 50, ISBN 978-0-8176-4305-8, MR 2025063 
  4. 1 2 3 4 5 6 7 8 9 Durell, C. V.; Robson, A. (2003) [1930], Advanced Trigonometry, Courier Dover, ISBN 978-0-486-43229-8 
  5. ↑ Bradley, Christopher J. (2007), The Algebra of Geometry: Cartesian, Areal and Projective Co-Ordinates, Highperception, tr. 179, ISBN 1906338000, OCLC 213434422 
  6. ↑ Hajja, Mowaffaq (2008), “A condition for a circumscriptible quadrilateral to be cyclic” (PDF), Forum Geometricorum 8: 103–6 
  7. ↑ Peter, Thomas (tháng 9 năm 2003), “Maximizing the area of a quadrilateral”, The College Mathematics Journal 34 (4): 315–6, JSTOR 3595770 
  8. 1 2 Coxeter, Harold Scott MacDonald; Greitzer, Samuel L. (1967), “3.2 Cyclic Quadrangles; Brahmagupta's formula”, Geometry Revisited, Mathematical Association of America, tr. 57, 60, ISBN 978-0-88385-619-2 
  9. ↑ Prasolov, Viktor, Problems in plane and solid geometry: v.1 Plane Geometry (PDF) 
  10. ↑ Alsina, Claudi; Nelsen, Roger (2009), “4.3 Cyclic, tangential, and bicentric quadrilaterals”, When Less is More: Visualizing Basic Inequalities, Mathematical Association of America, tr. 64, ISBN 978-0-88385-342-9 
  11. 1 2 3 Alsina, Claudi; Nelsen, Roger B. (2007), “On the diagonals of a cyclic quadrilateral” (PDF), Forum Geometricorum 7: 147–9 
  12. 1 2 Johnson, Roger A., Advanced Euclidean Geometry, Dover Publ., 2007 (orig. 1929).
  13. ↑ Inequalities proposed in Crux Mathematicorum, 2007, Problem 2975, p. 123
  14. ↑ Inequalities proposed in "Crux Mathematicorum", .
  15. ↑ “ABCD is a cyclic quadrilateral. Let M, N be midpoints of diagonals AC, BD respectively...”. Art of Problem Solving. 2010. 
  16. ↑ A. Bogomolny, An Identity in (Cyclic) Quadrilaterals, Interactive Mathematics Miscellany and Puzzles,, Accessed 18 March 2014.
  17. ↑ Siddons, A. W.; Hughes, R. T. (1929), Trigonometry, Cambridge University Press, tr. 202, OCLC 429528983 
  18. ↑ Hoehn, Larry (tháng 3 năm 2000), “Circumradius of a cyclic quadrilateral”, Mathematical Gazette 84 (499): 69–70, JSTOR 3621477 
  19. ↑ "Cyclic quadrilateral" trên wikipedia: https://en.wikipedia.org/wiki/Cyclic_quadrilateral
  20. ↑ Buchholz, R. H.; MacDougall, J. A. (1999), “Heron quadrilaterals with sides in arithmetic or geometric progression”, Bulletin of the Australian Mathematical Society 59 (2): 263–9, MR 1680787, doi:10.1017/S0004972700032883 

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